The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 70
Fig. 60. ASTRONOMY. 51 its Forward Motion. — 1£ the ball Cwere fired fast enough toreach the line A D beyond the point D, it would be fartherfrom the surface at the end of the second than when itstarted. Its orbit would no longer be circular, but ellipti- … Fig. 61. cat. If the speed of projection were gradually augmented,the orbit would become a more and more elongated ellipse.At a certain rate of projection, the orbit would become aparabola; at a still greater rate,a hyperbola. 51. The Moon held in herOrbit by Gravity. — Newton com-pared the…
Astronomy
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